Type 1 diabetes can have three more and one less (more drinking, more eating, more urination, and weight loss), and the symptoms are highly variable, so it is recommended that patients who notice abnormal blood glucose levels seek medical attention in a timely manner. Type 1 diabetes is a disease in which pancreatic β-cells are destroyed and insulin secretion is absolutely insufficient. Most of the cases start in adolescence, and the cause of the disease is not yet clear. The onset of the disease is more acute and the symptoms are more obvious, most of them have symptoms of excessive drinking, excessive eating, excessive urination and weight loss. A few are accompanied by acute complications of diabetes, such as diabetic ketoacidosis, which can cause nausea, vomiting, headache, impaired consciousness and other symptoms. It is recommended that patients with type 1 diabetes go to the endocrinology department of regular hospitals in a timely manner to improve the relevant examinations and standardize the treatment under the guidance of the doctor, so as to avoid delaying the condition or leading to adverse reactions.